James 5:12

But above all things, my brethren, swear not, neither by heaven, nor by earth, nor by any other oath: but let your yea be yea, and your no, no; that ye fall not under condemnation.

Matthew 5:33-37

Again ye have heard that it was said to those of old, "Thou shalt not perjure thyself, but shalt perform to the Lord thine oaths:"

Matthew 23:16-22

Wo unto you ye blind guides! who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, it is binding.

1 Corinthians 11:34

And if any man be hungry, let him eat at home; that ye meet not together for condemnation. And the other matters I will regulate when I come.

2 Corinthians 1:17-20

Such then being my intention, did I indeed change it with levity? or the things which I purpose, do I purpose after the flesh, that with me there should be yea, yea, and nay, nay?

James 3:1-2

MY brethren, be not many teachers, knowing that we shall receive a severer judgment.

1 Peter 4:8

But above all things have fervent love towards each other: for love will conceal a multitude of faults.

3 John 1:2

Beloved, above all things I pray that thou mayest prosper, and be in sound health of body, even as thy soul prospereth.

Treasury of Scripture Knowledge

Summary

But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation.

Bible References

Above

1 Peter 4:8
But above all things have fervent love towards each other: for love will conceal a multitude of faults.
3 John 1:2
Beloved, above all things I pray that thou mayest prosper, and be in sound health of body, even as thy soul prospereth.

Swear not

Matthew 5:33
Again ye have heard that it was said to those of old, "Thou shalt not perjure thyself, but shalt perform to the Lord thine oaths:"
Matthew 23:16
Wo unto you ye blind guides! who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, it is binding.

But

2 Corinthians 1:17
Such then being my intention, did I indeed change it with levity? or the things which I purpose, do I purpose after the flesh, that with me there should be yea, yea, and nay, nay?

Lest

James 3:1
MY brethren, be not many teachers, knowing that we shall receive a severer judgment.
1 Corinthians 11:34
And if any man be hungry, let him eat at home; that ye meet not together for condemnation. And the other matters I will regulate when I come.